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Comparative study of the growth of sputtered aluminum oxide films on organic and inorganic substrates

Sep 17, 2013 09/13

by Stefan Sellner; Alexander Gerlach; Stefan Kowarik; Frank Schreiber; Helmut Dosch; Stephan Meyer; Jens Pflaum; Gerhard Ulbricht

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We present a comparative study of the growth of the technologically highly relevant gate dielectric and encapsulation material aluminum oxide in inorganic and also organic heterostructures. Atomic force microscopy studies indicate strong similarities in the surface morphology of aluminum oxide films grown on these chemically different substrates. In addition, from X-ray reflectivity measurements we extract the roughness exponent \beta of aluminum oxide growth on both substrates. By...
Source: http://arxiv.org/abs/0711.5019v1

PubMed Central

39 39

Vol 9: Organic Fertilization and Sufficient Nutrient Status in Prehistoric Agriculture? - Indications from Multi-Proxy Analyses of Archaeological Topsoil Relicts.

Oct 4, 2014 10/14

by Lauer, Franziska; Prost, Katharina; Gerlach, Renate; Patzold, Stefan; Wolf, Mareike; Urmersbach, Sarah; Lehndorff, Eva; Eckmeier, Eileen; Amelung, Wulf

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This article is from PLoS ONE , volume 9 . Abstract Neolithic and Bronze Age topsoil relicts revealed enhanced extractable phosphorus (P) and plant available inorganic P fractions, thus raising the question whether there was targeted soil amelioration in prehistoric times. This study aimed (i) at assessing the overall nutrient status and the soil organic matter content of these arable topsoil relicts, and (ii) at tracing ancient soil fertilizing practices by respective stable isotope and...
Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4152168

Arxiv.org

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Strongly Enhanced Thermal Stability of Crystalline Organic Thin Films Induced by Aluminum Oxide Capping Layers

Sep 21, 2013 09/13

by Stefan Sellner; Alexander Gerlach; Frank Schreiber; Marion Kelsch; Nikolai Kasper; Helmut Dosch; Stephan Meyer; Jens Pflaum; Matthias Fischer; Bruno Gompf

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We show that the thermal stability of thin films of the organic semiconductor diindenoperylene (DIP) can be strongly enhanced by aluminum oxide capping layers. By thermal desorption spectroscopy and in-situ X-ray diffraction we demonstrate that organic films do not only stay on the substrate, but even remain crystalline up to 460C, i.e. 270 deg. above their desorption point for uncapped films (190C). We argue that this strong enhancement of the thermal stability compared to uncapped and also...
Source: http://arxiv.org/abs/cond-mat/0407588v1

Arxiv.org

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Optical Properties of Pentacene and Perfluoropentacene Thin Films

Sep 18, 2013 09/13

by Alexander Hinderhofer; Ute Heinemeyer; Alexander Gerlach; Stefan Kowarik; Robert M. J. Jacobs; Youichi Sakamoto; Toshiyasu Suzuki; Frank Schreiber

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The optical properties of pentacene (PEN) and perfluoropentacene(PFP) thin films on various SiO2 substrates were studied using variable angle spectroscopic ellipsometry. Structural characterization was performed using X-ray reflectivity and atomic force microscopy. A uniaxial model with the optic axis normal to the sample surface was used to analyze the ellipsometry data. A Strong optical anisotropy was observed and enabled the direction of the transition dipole of the absorption bands to be...
Source: http://arxiv.org/abs/0707.3768v1

Arxiv.org

0 0.0

Two planets around Kapteyn's star : a cold and a temperate super-Earth orbiting the nearest halo red-dwarf

Jun 30, 2018 06/18

by Guillem Anglada-Escudé; Pamela Arriagada; Mikko Tuomi; Mathias Zechmeister; James S. Jenkins; Aviv Ofir; Stefan Dreizler; Enrico Gerlach; Chris J. Marvin; Ansgar Reiners; Sandra V. Jeffers; R. Paul Butler; Steven S. Vogt; Pedro J. Amado; Cristina Rodríguez-López; Zaira M. Berdiñas; Julian Morin; Jeff D. Crane; Stephen A. Shectman; Ian B. Thompson; Matías Díaz; Eugenio Rivera; Luis F. Sarmiento; Hugh R. A. Jones

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Exoplanets of a few Earth masses can be now detected around nearby low-mass stars using Doppler spectroscopy. In this paper, we investigate the radial velocity variations of Kapteyn's star, which is both a sub-dwarf M-star and the nearest halo object to the Sun. The observations comprise archival and new HARPS, HIRES and PFS Doppler measurements. Two Doppler signals are detected at periods of 48 and 120 days using likelihood periodograms and a Bayesian analysis of the data. Using the same...
Topics: Instrumentation and Methods for Astrophysics, Earth and Planetary Astrophysics, Astrophysics of...
Source: http://arxiv.org/abs/1406.0818

Community Media

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Zum neuen GedenkstÃ¤tten-Konzept der Bundesregierung

Aug 18, 2008 08/08

by Prof. Dr. Gerhard Fischer, Dr. Hannelore Bernhardt, Prof. Dr. Heinz Deutschland, Prof. Dr. Stefan Doernberg, Prof. Dr. Manfred Gerlach, Manfred Hegner, Gisela Karau, Herbert Kelle, Egon Krenz, Erhard Lonscher, Siegfried Lorenz, Dr. Hans Modrow, Prof. Dr. Harry Nick, Prof. Dr. Heinz Niemann, Dr. Klaus Panster, Prof. Dr. Siegfried Prokop, Dr. Anita Rausch, Eberhard Rehling, Dr. Hans Reichelt, Prof. Dr. Wolfgang Richter, Dr. Wolfgang Schwanitz

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Stellungnahme des Berliner Alternativen Geschichtsforums. VerÃ¶ffentlicht auf der Website der Linken.
Topics: SED, PDS, DIE LINKE, DDR, Berlin, Bundesbeauftragte fÃ¼r Kultur und Medien

Arxiv.org

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No evidence for activity correlations in the radial velocities of Kapteyn's star

Jun 28, 2018 06/18

by Guillem Anglada-Escudé; Mikko Tuomi; Pamela Arriagada; Mathias Zechmeister; James S. Jenkins; Aviv Ofir; Stefan Dreizler; Enrico Gerlach; Chistopher J. Marvin; Ansgar Reiners; Sandra V. Jeffers; Paul Butler; Steven S. Vogt; Pedro J. Amado; Cristina Rodríguez-López; Zaira M. Berdiñas; Julien Morin; Jeffrey D. Crane; Stephen A. Shectman; Matías Díaz; Luis F. Sarmiento; Hugh R. A. Jones

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Stellar activity may induce Doppler variability at the level of a few m/s which can then be confused by the Doppler signal of an exoplanet orbiting the star. To first order, linear correlations between radial velocity measurements and activity indices have been proposed to account for any such correlation. The likely presence of two super-Earths orbiting Kapteyn's star was reported in Anglada et al. (2014, MNRAS 443L, 89A), but this claim was recently challenged by Robertson et al. (2015, ApJ...
Topics: Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1506.09072

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